Drafting instrument



1 J. A. KAMINSKI D RAFTING INSTRUMENT ZZZ;

Patented July 10, 1923.

mean

rarer JOZEPH A. KAMINSKI, 0]? CHICAGO, ILLINOIS.

DRAFTING INSTRUMENT.

Application filed December 20, 1920. Serial No. 431,829.

T 0 all whom it may, concern Be it known that I, Joznrn A. KAMrNsKr, a citizen of Poland, residing at Chicago, in the county of Cook and State of lllinols, have invented a certain new and useful Improvement in Drafting Instruments, of which the following is a full, clear, conclse, and exact description, reference being had to the accompanying drawings, formlng a part of this specification.

The invention relates to drafting lnstruments and primarily to compasses, of the beam type.

The invention has among its various ob jects the provision of a compact construction which may be extended and contracted so that circles of various diameters may be drawn with ease and precision, and either in pencil or in ink, as the construction is such that it will readily accommodate an instrumentality whereby this can be done without demanding a separate holding element such as now are resorted to, the device being designed so as to accommodate the ordinary ruling pen and an ordinary pencll.

It is a further object to construct a device of this character in which that end of the compass to which the delineator is attached may be moved vertically and horizontally, relatively to point which is usually set into the paper and forms the center of the circle.

The structure also has an object the provision of an extremely simple arrangement whereby a spiral may be easily and accurately drawn without shifting the centers in a manner similar to that now resorted to when describing a spiral.

The invention has these and other objects all of which will be explained in detail and more readily understood when read in conjunction with the accompanying drawings which illustrate one embodiment of the invention, it being understood, however, that the invention is not limited to the precise construction illustrated, the scope of the invention being defined by the appended claims forming a part hereof.

In the drawings Fig. 1 is a side elevation of a device constructed according to the invention;

Fig. 2 is a top shown in Fig. 1;

Fig. 3 is a sectional view of one end of the device shown in Figs. 1 and 2;

plan view 01"- the structure Fig. 4 is a plan view of the opposite end,

and

Fig. 5 is a detail of construction resorted to, to lock the parts together.

In the embodiment of the invention illustrated in the drawings a base or standard 10 is contemplated to which is pivotally secured a plurality of longitudinally adjustable, tubular telescope sections 11, 12, 13 and 14, the latter of which is provided with a member 15 to which either a pen or pencil may be attached, depending upon which of these instrumentalities is desired to be used.

Each of these sections 11 to 14 are provided with a clamping device generally designated 16 which may be manipulated to vertically adjustable element 18 is mounted. 1

This adjustable element carries the needle 19 at its lowermost end and also has the element 20 rotatably secured adjacent its uppermost end.

The needle 19 is arranged within a member 21 which is threaded into the lowermost end of the part 18 and has a tapered apertured portion 22 to hold the needle, which is also tapered, from becoming disassociated from the part 21, it being understood that the opposite end of the needle abuts against the termination of the internally threaded portion 23, and thus as the part 21 is adjusted within the threaded portion 23 the needle will be adjusted and held with relation to these portions. As before stated, the element 18 is virtually adjustable with relation to the standard 10, it being locked in adjusted position by means of the lock nut 24 which is arranged upon the threaded portion 25 of the part 18 which operates in the threaded aperture 17. The part 18 is provided with a knurled portion 26 for the purpose of facilitating the adjustment of the part 18 with relation to the base 10. The uppermost end of the part 18 is reduced to provide the stub shaft 27 and the shoulder 28 'upon which to rotat-ably mount the part 20, thisportion being held with relation to the part 18 by means of the element 29 which includes the portion 30 which is threaded into thethreaded portion 31 of the stub shaft 27. This element 29 is further provided with the knurled portion .32 which is an integral portion of the part 29 and is provided for the purpose of assisting in securing the parts togetherand permitting their separation. A spindle 33 projects from the knurled portion and has a sleeve 34 provided thereon which may be removed from the spindle or locked with respect thereto by means of the lock nut 35.

The object of the sleeve 84 will be fully explained in detail hereinafter as it performs-a function which'is one of the objects of the invention.

Astructure generally designated by the numeral36is pivotally secured to the part 20"by*1neans of the pivot pin 37. This portion-'36 has the tubular portion 38 extending, therefrom and carries the tubular member 11 which is arranged for longitudinaladjustment'with respect to the part 38. This .member 11 has a portion 39 which extends through the slot 40 provided in the portion-38 and into engagement with the rotatable threaded portion 41, the opposite ends-of which are mounted in the brackets 42 and 43' respectively, and which extend from the part 38, the latter of which is bifurcated and has the knurled adjusting part 44'arranged between the bifurcations. This part 44 is permanently secured to the threadedportion 41 and as the part 44 is rotated causes the extension 39 to be moved along the threaded part and along the slot 40.

This 'part'44 is provided with indicia so that the adjustment of the parts by this portion "can'be readily determined. The part 39 carriesa-n indicating finger 45 Iwhich co--operates with" indicia '46 provided upon the pa=rt-38-, this indicia being employed to assist in attaining one adjustment, the arra'ngement; including the indicia provided upon'the part 44 being resorted to when greater precision is desired. It is of course understood that any adjustment of the parts just described also affects the other elements, such as ll to 14, as these are all connected together, and adjustable relatively to the base 10 anditsassociated parts.

All of the portions 11 to 14 are provided with a securing means such as shown in detail inFig. 5. The part 11, however, is provided with a rest 47 which may be swung to the positions shown in Fig. 1. l

The clamping means resorted to in the structure illustrated contemplates slotting one end of: each one of the outermost telescopic portions as shown at48, and providing this portion with a split threaded part 49" having the conical portion 50. A nut 51 is' provided with a conical part 52 which cooperates with the conical part 50 of the part jaws 53 and 54 which are pivoted at 55, they I being held in extended relation by-means'of the expansion spring-S6 which is arranged upon the pin 57 which extends through "both jaws and is 'provided with the adjusting :nut 58.. These jaws are each furtherprovi ded with the angular recesses 5959' and the cir-- cular recesses 60 60, the former'being pro-- vided to accommodate a pencil and the latter to receive the ordinary ruling pen."

One of these jaws is provided with a pivoted handle 61 whereby the device as a whole may be manipulated with greater ease.

As hereinbefore stated the structure includes a means whereby a spiral instead of means includes the sleeve 34 arranged upon I the spindle 33, a cord or wire 62 which is secured to these parts and extends to and is fastened to the pin 63 of the part 15.

This wire is clamped between the element I 34- and part 29 and one of the sections-11 to 14 is slidably connected to the other, thus as these portions and the part 36 are ro--' tated upon the stub shaft 27, the wire or cord is wound or wrapped around the sleeve 34,

drawingqthe slidable sections towards-the center or stub shaft. In other words, the length of the arm produced by the telescopic sections is reduced or shortened proportionately to the diameter oil. the sleeve 84', each revolution of the arm. It is contemplated to change these sleeves according to the space desired between each convolution of the spiral. It is otjcourse understood that this wire is omitted from the structure under ordinary conditions and only applied when a spiral is to be drawn, 2 Y

Having described the invention what I claim and desire to cover by Letters Patent is 1. In a device of ed to the support, said member having a marking element connected thereto, said member including a plurality of'telescopic members adapted to be extended and re the class described the combination of a support, a memberconnect- 90 a circle may be accurately drawn. This her in a lengthwise direction to cause its ad justment, a marking element connected to said member, said member beingrotatable and including means whereby it describes a spiral when rotated.

3. In a drafting instrument the combination of a support, a longitudinally extensible member hingedly connected to the support, a marking element connected to said member, said member being operable'to describe a spiral when rotated.

a. In a drafting instrument the combination of a support, a bar having a marking element and connected thereto, means for adjusting the bar longitudinally, and means whereby the marking element may be actuated to describe a spiral, said means including a flexible member extending from said bar to the support.

'5. A drafting instrument the combination of a support, a pointed element adjustable relatively to the support, a member rotatable relatively to the support, an extensible 7 member extending from'the first mentioned member, said first mentioned member and extensible member having co-operating means for actuating the extensible member. In Witness whereof, I hereunto subscribe my name this 18th day of December A. D., 1920.

JOZEPH A. KAMINSKI. 

